Thames Water is using a state-of-the-art new technique to strengthen two of its major water pipes in North London.

The £7 million project, which started this week will see the water company use tough plastic lining on two cast iron water mains between Seven Sisters Road and Myddleton Avenue in Hackney.

Last year, properties were flooded and residents were left without water after a pipe burst in Finsbury Park. Following an investigation of the water network in the area, Thames Water decided to strengthen the two mains, which were originally laid in the Victorian era, to greatly reduce the risk of further bursts.

The company will be using an innovative die-drawing technique to strengthen the network, which sees the plastic lining stretched through the inside of the existing pipes. It is then allowed to expand to match their size – creating a seal.

The method means fewer trenches will need to be dug to access the pipework and the lining will be completed quicker than traditional methods, significantly reducing disruption above ground.

Commenting on the die-drawing technique to strengthen the mains, Mike Kodua, Thames Water’s network programme manager, said:

“This is an important piece of work to strengthen the water network in the area, which will help avoid a distressing and damaging burst like we saw last year.

“As well as protecting the water supply in the area for future generations, the work will be carried out in a way designed to cause the least disruption on the road.

“It’s vital we continue investing in our ageing networks to safeguard the supply of clean water in the future.”

The project will take place in two phases, with work on the first main due to be completed by January before engineers move on to the second pipe between February and July 2021.

Engineers have also fitted a section of ductile iron pipe more than three feet wide and 5.5 metre-long as repairs continue on the original 42-inch cast iron Victorian water main in Hackney which burst on October 6.

The burst caused water outages to areas of East London, with teams from the company working through the night to find and stop the leaking pipe, located in an area of dense woodland in the busy London borough.

With the section of pipe on the key strategic main temporarily out of service, Thames Water used the opportunity to identify and start repairs on five additional parts of the pipe.

As the existing pipe was slightly oval in shape, specialist fittings also had to be manufactured to ensure the new section fit with a watertight seal.

Hackney has 68km of trunk mains, most of which are from the Victorian era. The borough has the highest proportion of mains replaced by Thames Water, with 56% having been upgraded since 2000.

The company also carries out more than 1,000 valve checks a year and has installed 9,000 smart meters in Hackney since 2015, with almost 5,000 more due in the next five years.